A study of clustering of childhood leukemia by hospital of birth.
D002140:California; D002675:Child, Preschool; D004812:Epidemiologic Methods; D006761:Hospitals; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007938:Leukemia / Q000453:epidemiology* / Q000209:etiology / Q000401:mortality; D013997:Time Factors